HEF4066BT from Nexperia, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	1Y	bidirectional	Switch 1 analog I/O terminal Y. Bidirectional analog signal path to 1Z when enable 1E is HIGH. Signal voltage range 0 V to VDD; typical RON ~80 Ω at VDD = 10 V.
2	1Z	bidirectional	Switch 1 analog I/O terminal Z. Bidirectional analog signal path to 1Y when enable 1E is HIGH. Signal voltage range 0 V to VDD.
3	2Z	bidirectional	Switch 2 analog I/O terminal Z. Bidirectional analog signal path to 2Y when enable 2E is HIGH.
4	2Y	bidirectional	Switch 2 analog I/O terminal Y. Bidirectional analog signal path to 2Z when enable 2E is HIGH.
5	2E	input	Switch 2 enable input, active HIGH. When HIGH the 2Y-2Z switch is ON; when LOW the switch is OFF. VIH ≥ 3.5 V at VDD = 5 V; VIL ≤ 1.5 V.
6	3E	input	Switch 3 enable input, active HIGH. When HIGH the 3Y-3Z switch is ON; when LOW the switch is OFF.
7	VSS	power_in	Ground reference (0 V). Negative supply rail for the device.
8	3Y	bidirectional	Switch 3 analog I/O terminal Y. Bidirectional analog signal path to 3Z when enable 3E is HIGH.
9	3Z	bidirectional	Switch 3 analog I/O terminal Z. Bidirectional analog signal path to 3Y when enable 3E is HIGH.
10	4Z	bidirectional	Switch 4 analog I/O terminal Z. Bidirectional analog signal path to 4Y when enable 4E is HIGH.
11	4Y	bidirectional	Switch 4 analog I/O terminal Y. Bidirectional analog signal path to 4Z when enable 4E is HIGH.
12	4E	input	Switch 4 enable input, active HIGH. When HIGH the 4Y-4Z switch is ON; when LOW the switch is OFF.
13	1E	input	Switch 1 enable input, active HIGH. When HIGH the 1Y-1Z switch is ON; when LOW the switch is OFF.
14	VDD	power_in	Positive supply voltage. Recommended operating range 3 V to 15 V; absolute maximum 18 V.

Key specifications

Parameter	Value
Manufacturer	Nexperia
Package	SOIC-14
Category	Interface
Pins	14

Ordering variants

Same part, different packaging or reel option.

HEF4066BTT

CAD (KiCad official)

Symbol: HEF4066BT
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`hef4066bt.step`	195 KB	You want the bare part, or you mark your own boards.
`hef4066bt-etched.step`	2.2 MB	You want the part with `HEF4066BT` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 555 faces against 237 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Nexperia datasheet (13 pp, sha256 bec03e3d3a079926, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF